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import itertools
from ..util import properties
from ..backend import KeyringBackend
from .. import errors
class MultipartKeyringWrapper(KeyringBackend):
"""A wrapper around an existing keyring that breaks the password into
smaller parts to handle implementations that have limits on the maximum
length of passwords i.e. Windows Vault
"""
def __init__(self, keyring, max_password_size=512):
self._keyring = keyring
self._max_password_size = max_password_size
@properties.ClassProperty
@classmethod
def priority(cls):
return 0
def get_password(self, service, username):
"""Get password of the username for the service
"""
init_part = self._keyring.get_password(service, username)
if init_part:
parts = [init_part,]
i = 1
while True:
next_part = self._keyring.get_password(
service,
'%s{{part_%d}}' %(username, i))
if next_part:
parts.append(next_part)
i += 1
else:
break
return ''.join(parts)
return None
def set_password(self, service, username, password):
"""Set password for the username of the service
"""
segments = range(0, len(password), self._max_password_size)
password_parts = [
password[i:i + self._max_password_size] for i in segments]
for i, password_part in enumerate(password_parts):
curr_username = username
if i > 0:
curr_username += '{{part_%d}}' %i
self._keyring.set_password(service, curr_username, password_part)
def delete_password(self, service, username):
self._keyring.delete_password(service, username)
count = itertools.count(1)
while True:
part_name = '%(username)s{{part_%(index)d}}' % dict(
index = next(count), **vars())
try:
self._keyring.delete_password(service, part_name)
except errors.PasswordDeleteError:
break